Air-heating device for stoves.



1,190,873, Patented July 11, 1916.

W. T. DUNNING.

AIR HEATING DEVICE FOR STOVES. APPLICATION FILED MAR. 9, 1915.

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WILLIAM '1. DUNNING, OF RIDLEY PARK, PENNSYLVANIA.

AIR-HEATING DEVICE FOR STOVE-S.

To all whom it may concern:

Be it known that I, WILLIAM T. DUN- NING, a citizen of the UnitedStates, residing at Ridley Park, in the county of Delaware and State ofPennsylvania, have invented a certain new and useful Improvement in Air-I'Ieating Devices for Stoves, whereof the following is a specification,reference being had to the accompanying drawing.

My improvement relates to devices including a stove lid having atortuous air passageway leading from the top thereof to the interior ofthe stove; said lid having at the top thereof a valve controlling theeffective area of the inlet to said passageway.

In the form of my invention hereinafter described the tortuouspassageway is a slightly conical helical spiral, formed entirely in asingle casting which is primarily separate from the lid but removablyattached thereto, with a disk gasket formed of a sheet of flexiblematerial which is a nonconductor, of heat between said casting and lid,and the inlet is at the outer end of the spiral but communicatesdirectly with the center of the spiral by a radial passageway; so thatthe air passes downwardly through the lid at the outer convolution ofthe spiral, thence radially inward to the center convolution of thespiral and thence spirally outward and downward from the center of thespiral to radially opening outlets in the outer convolution thereofthrough which the air is discharged beneath the lid to the interior ofthe stove.

My invention includes the various novel features of construction andarrangement hereinafter more definitely specified. I

In the drawings; Figure I is a plan view of a stove lid embodying myimprovement. Fig. II is an inverted plan view of said lid. Fig. III is asectional view'ofsaid lid, taken on the line III, III in Figs. I and IIand showing its relation to the stove lid. p

In said figures; the stove top 1 has the lid opening 2 with the flange3, to receive and support the lid 4. Said lid 4 is a single planecasting having an air inlet 6 opening therethrough, controlled by theslide-valve plate 7 which is fitted to reciprocate in the depression 9in the top of the lid in which it is held by the rivet 10 which extendsthrough the slot 11 in said plate. Said plate 7 has the groove 12 in itsupper surface by which it may be engaged to be slid, and has the index14 to selectively register Specification of Letters Patent.

Patented July 11, 1916.

Application filed March 9, 1915. Serial No. 13,249.

with the graduations 15 in the respective positions of said valveindicated by the words Off Night Hot which are conveniently formed byraised letters in the depression 16 in the top of the lid. When in theposition indicated by the word Off said valve entirely closes the airinlet. When in the position indicated by the word Night, said valvepartly closes said inlet, and when in the position indicated by Hot saidvalve leaves the inlet fully opened. Said inlet opens into atortuouspassageway 18 which is formed entirely in the single casting 19which is primarily separate from said lid 2 but is removably attachedthereto conveniently by the three screws 20 in the disk gasket 21,formed of a sheet of flexible asbestos fabric or other material which isa non-conductor of heat, between said casting and lid. Said inlet 6 isat the outer end of the spiral passageway 18 in said casting, butcommunicates directly with the center of said spiral by the radialpassageway 24; so that the air passes downward through the lid at theouter convolution of the spiral, thence radially inward to the centerconvolution of the spiral and thence spirally outward and downward fromthe center of the spiral to the radially opening outlets 25 in the outerconvolution thereof through which the air is discharged beneath the lidto the interior ofthe stove. It may be observed that said casting 19 isconically hollow and spirally corrugated upon its under surface toconcentrate, upon said casting, the heat from the fire beneath it, andto present for absorption of such heat a larger surface than would bepresented if said casting were plane faced. Moreover, the tortuouspassageway 18 is formed in said casting by the spiral rib 26 in unitaryrelation with said casting and affordinga maximum-surface thereof forexposure to the incoming air, to impart to itthe heat absorbed asaforesaid. It is to be understood that the atmospheric air is caused toflow inwardly from the outer atmosphere to the interior of the stovethrough the tortuous passageway in the heating device above described,byv the ordinary draft of the stove; although the influx of air throughsaid passagewayis controllable by the slide valve above described,independently of the means controlling such ordinary draft. I do notdesire to limit myself to the pre c'ise details of construction andarrangement herein set forth as it is obvious that various modificationsmay be made therein without departing from the essential features of myinvention as defined in the appended claims.

I claim:

1. The combination with a stove lid hav-' ing a rectangular air inletleading from the top thereof to the interior of the stove, a planedepression including said inlet and extending therefrom toward thecenter of the lid, another plane depression adjoining the first nameddepression, a series of graduations upon the portion of the lid betweensaid depressions, and means forming the words Off, Night and Hot in thelast named depression respectively corresponding with marks in saidseries of graduations; of a plane rectangular slide valve plate fittedto reciprocate in the first named depression, to vary the effective areaof said inlet, and having a slot therein, extending radially withrespect to the lid; a rivet, extending through said lid and said slot insaid plate and having a head in the latter preventing the removal ofsaid plate; a single casting primarily separate from said lid, having aconical spiral air' passageway formed therein, by an upwardly extendingspiral rib in unitary relation with said casting, with the outer end ofsaid passageway registering with said inlet in said lid, and having aradial passagewayleading directly from said outer end of the spiral tothe center thereof, and radially opening outlets at the outerconvolution of said spiral, opening 'to the interior of the stove; adisk gasket,

formed of a sheet of material which is a nonconductor of heat,interposed betwen the under side of said lid and the top of saidcasting; means removably connecting said lid, casting and gasket inassembled rela tion, including three screws symmetrically disposed withrespect to said lid, extending through the latter in engagement withsaid casting; whereby a stream of air may be heated and dischargedthrough said lid into the stove at a rate and temperature affected bysaid valve.

2. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, a depression including saidinlet, another depression adjoining the first named depression, a seriesof graduations upon the portion of the lid between said depressions, andmeans form ing the words Off Night and Hot in the last named depressionrespectively corresponding with marks in said series of graduations; ofa plane slide valve plate fitted to reciprocate in the first nameddepression, to vary the effective area of said inlet, and having a slottherein, extending radially with respect to the lid; a rivet, extendingthrough said lid and said slot in said plate and having a head in thelatter preventing the removal of said plate; a single casting primarilyseparate from said lid, having a conical spiral air passageway formedtherein, by an upwardly extending spiral rib in unitary relation withsaid casting, with the outer end of said passageway registering withsaid inlet in said lid, and having a passageway leading from said outerend of the spiral to the center thereof, and outlets at the outerconvolution of said spiral, opening to the interior of the stove; a diskgasket, interposed between the under side of said lid and the top ofsaid casting; means removably connecting said lid, cast ing and gasketin assembled relation, including screws extending through the lid inengagement with said casting; whereby a stream of air may be heated anddischarged through said lid into the stove at a rate and temperatureaffected by said valve.

3. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, a depression including saidinlet, a series of graduations upon the lid, and means forming the wordsOff, Night and Hot respectively corresponding with marks in said seriesof graduations; of a valve fitted in the first named depression, to varythe effective area of said inlet, and having a slot therein, extendingradially with respect to the lid; a rivet, extending through said lidand said slot in said plate and having a head in the latter preventingthe removal of said plate; a single casting primarily separate from saidlid, having a conical spiral air passageway formed therein, by anupwardly extending spiral rib in unitary relation with said casting,with the outer end of said passageway registering with said inlet insaid lid, and having a passageway leading from said outer end of thespiral to the center thereof, and outlets at the outer convolution ofsaid spiral, opening to the interior of the stove; a gasket, interposedbetween the under side of said lid and the top of said casting; meansconnecting said lid, casting and gasket in assembled relation, extendingthrough the lid in engagement with said casting; whereby a stream of airmay be heated and discharged through said lid into the stove at a rateand temperature affected by said valve.

4. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, a depression including saidinlet, a series of graduations upon the lid, and means forming the wordsOff, Night and Hot respectively corresponding with marks in said seriesof graduations; of a valve fitted in the first named depression, to varythe effective area of said inlet, and having a slot therein, extendingradially with respect to the lid; a rivet, extending through said lidand said slot in said plate and having a head in the latter preventingthe removal of said plate; a single casting primarily separate from saidlid, having a spiral air passageway formed therein, by an upwardlyextending spiral rib in unitary relation with said casting, with theouter end of said passageway registering with said inlet in said lid,and having a passageway leading from said outer end of the spiral to thecenter thereof, and outlets opening to the interior of the stove; agasket, interposed between the under side of said lid and the top ofsaid casting; means connecting said lid, casting and gasket in assembledrelation, extending through the lid in engagement with said casting;whereby a stream of air may be heated and discharged through said lidinto the stove at a rate and temperature affected by said valve.

5. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, of a valve fitted to vary theefiective area of said inlet, and having a slot extending radially withrespect to the lid; a rivet, extending through said lid and said slot insaid plate and having a head in the latter preventing the removal ofsaid plate; a single casting primarily separate from said lid, having aspiral air passageway formed therein, by an upwardly extending spiralrib in unitary relation with said casting, with the outer end of saidpassageway registering with said inlet in said lid, and having apassageway leading from said outer end of the spiral to the centerthereof, and outlets opening to the interior of the stove; a gasket,interposed between the under side of said lid and the top of saidcasting; means connecting said lid, casting and gasket in assembledrelation, extending through the lid in engagement with said casting;whereby a stream of air may be heated and discharged through said lidinto the stove at a rate and temperature affected by said valve.

6. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, of a valve fitted to vary theeffective area of said inlet, and having a slot extending radially withrespect to the lid; a rivet, extending in said slot and preventing theremoval of said plate; a single casting primarily separate from saidlid, having a spiral air passageway formed therein, by an upwardlyextending spiral rib in unitary relation with said casting, with theouter end of said passageway registering with said inlet in said lid,and having a passageway leading from said outer end of the spiral to thecenter thereof, and outlets opening to the interior of the stove; agasket, interposed between the under side of said lid'and the top ofsaid casting; and means connecting said lid, casting and gasket inassembled relation.

7. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove, of a valve fitted to vary theeffective area of said inlet, and having a slot; a rivet, extending insaid slot and preventing the removal of said plate; a single castingprimarily separate from said lid, having a spiral air passageway formedtherein, by an upwardly extending spiral rib in unitary relation withsaid casting, with the outer end of said passageway registering withsaid inlet in said lid, and having a passageway, leading from said outerend of the spiral to the center thereof, and outlets opening to theinterior of the stove; a gasket, interposed between the under side ofsaid lid and the top of said casting; and means connecting said lid,casting and gasket in assembled relation.

8. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove; of a single casting primarilyseparate from said lid, having a spiral air passageway formed therein,by an upwardly extending spiral rib in unitary relation with saidcasting, with the outer end of'said passageway registering with saidinlet in said lid, and having a passageway leading from said outer endof the spiral'to the center thereof, and outlets opening to the interiorof the stove; a gasket, interposed between the under side of said lidand the top of said casting; and means connecting said lid, casting andgasket in assembled relation.

9. The combination with a stove lid having an air inlet leading from thetop thereof to the interior of the stove; of a single casting primarilyseparate from said lid, having a spiral air passageway formed therein,by an upwardly extending spiral rib in unitary relation with saidcasting, with the outer end of said passa eway registering with saidinlet in said li and hilV'. ing a passageway leading end of the spiralto the center thereof, and an outlet opening to the interior of thestove; a gasket, of refractory material, interposed between the underside of said lid and the top of said casting; and removable meansdetachably connecting said lid, casting and gasket in assembledrelation.

10. The combination with a stove lid having an air inlet leading fromthe top thereof to the interior of the stove; of a single casting havinga spiral air passageway formed therein, by an upwardly extending spiralrib in unitary relation with said castfrom said outerv ing, with theouter end of said passageway and an outlet opening to the interior ofthe stove; and removable means detachably connecting said lid andcasting. V

11. The combination with a stove lid having an air inlet leading fromthe top thereof to the interior of the stove; of a single casting havinga spiral air passageway formed therein, by an upwardly extending spiralrib in unitary relation with said easting, with the outer end of saidpassageway registering with said inlet in said lid, and having apassageway leading from said outer end of the spiral to the centerthereof, and an outlet opening to the interior of the stove; and meansrigidly oonnectingsaid lid and casting. a 12. The combination with astove lidhaving an air inlet leading from the top thereof to theinterior of the stove; of a single casting having a spiral passagewayformed therein with an outlet opening to the interior of the stove, atthe outer end of said passageway, and having a radial passagewayextending from the inner end of said spiral passageway to said air inletsaid radial passageway crossing the outer convolutions of said spiralpassageway without communication therewith.

In testimony whereof, I have hereunto signed my name at Philadelphia,Pennsyl vania, this sixteenth day of February, 1915.

WILLIAM T. DUNNING.

WVitnesses:

VVILLIAM N. OREILLY, J. D; l/VETZLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

